CN117306974A

CN117306974A - Damping hinge

Info

Publication number: CN117306974A
Application number: CN202311128091.2A
Authority: CN
Inventors: 邹莲; 许兴隆; 张海文; 季强; 钱峰; 王昊
Original assignee: Wuxi Haidaer Precision Slides Co ltd
Current assignee: Wuxi Haidaer Precision Slides Co ltd
Priority date: 2023-09-01
Filing date: 2023-09-01
Publication date: 2023-12-29

Abstract

The invention discloses a damping hinge, when the damping hinge is in an open state, an elastic component is locked with a second connecting piece and is in a compression state, the elastic component is separated from a door body fixing seat, and a supporting part of a fourth connecting piece is separated from a damping block of a speed reducing component; when the damping hinge is in a critical state, the elastic component and the second connecting piece are unlocked, the elastic component recovers deformation, is abutted with the door body fixing seat and rotates around the door body fixing seat, and the door body fixing seat drives the fourth connecting piece to rotate clockwise, so that the abutting part is abutted with the damping block in a rolling way, and the closing speed is reduced until the door body fixing seat enters a closing state. Therefore, when the door body is in an open state, the elastic component does not apply closing acting force to the door body, so that a user can conveniently take and put east and west; when the door body rotates in a critical state, the elastic component applies closing acting force to the door body, so that the door body and the cabinet body are finally and completely closed, and meanwhile, the self-closing speed can be reduced by matching the supporting part and the damping block, and the safety is ensured.

Description

Damping hinge

Technical Field

The present invention relates to hinges, and more particularly to damped hinges.

Background

In general, in order to ensure thermal insulation performance of a refrigerator, a door body is thicker, which requires a hinge connected between the door body and the refrigerator cabinet to have a larger opening degree so as to avoid interference between the door body and the refrigerator cabinet during opening/closing, and particularly, as embedded integrated refrigerators are increasingly popular, the door body of the refrigerator needs to be assembled to a cabinet door plate, which further increases the thickness of the whole door body, and the hinge is required to have a larger opening degree.

The Chinese patent publication No. CN112292500B discloses a furniture deceleration hinge, which adopts a deceleration device to reduce the speed of the door when the door is closed, but the door is in a completely opened state and tends to be closed by the elasticity of a spring, and can not be kept in an opened state under the condition of no external force, so that a user can take and put east and west conveniently.

Disclosure of Invention

In order to overcome the defects in the prior art, one of the purposes of the invention is to provide a device which can keep an open state when being completely opened, and is convenient for a user to take and put east and west; the door body and the cabinet body can be prevented from being completely closed by pre-tightening to the closed position when the door is closed, and the self-closing speed of the door body and the cabinet body is reduced to protect the damping hinge of the door body and the cabinet body and the refrigerator when the door is closed.

One of the purposes of the invention is realized by adopting the following technical scheme:

a damping hinge comprises a cabinet body fixing seat, a door body fixing seat, a first connecting piece, a second connecting piece, a third connecting piece, a fourth connecting piece, an elastic component and a speed reducing component,

the two ends of the first connecting piece are respectively connected with the cabinet body fixing seat and the second connecting piece in a rotating way, the two ends of the second connecting piece are respectively connected with the first connecting piece and the door body fixing seat in a rotating way, the two ends of the third connecting piece are respectively connected with the cabinet body fixing seat and the fourth connecting piece in a rotating way, the two ends of the fourth connecting piece are respectively connected with the first connecting piece and the door body fixing seat in a rotating way, the elastic component is rotationally arranged on the second connecting piece, the speed reducing component is rotationally arranged on the first connecting piece, the two ends of the speed reducing component are respectively connected with the first connecting piece and the fourth connecting piece in a rotating way, the fourth connecting piece comprises a supporting part, the supporting part is in a curved surface structure, the speed reducing component comprises a damping block for reducing the closing speed of the damping hinge,

When the damping hinge is in a fully opened state, the elastic component is locked with the second connecting piece and is in a compressed state, the elastic component is separated from the door body fixing seat, and the abutting part is separated from the damping block;

when the damping hinge is in a critical state, the elastic component and the second connecting piece are unlocked, the elastic component is deformed in a restoration mode to be abutted with the door body fixing seat and rotate around the door body fixing seat to drive the damping hinge to move towards a closed state, and the door body fixing seat drives the fourth connecting piece to rotate clockwise under the elasticity of the elastic component, so that the abutting part is abutted with the damping block in a rolling mode to reduce the closing speed of the damping hinge until the damping hinge enters the closed state.

Further, the supporting portion includes a first curved surface portion and a second curved surface portion located below the first curved surface portion, where a joint of the first curved surface portion and the second curved surface portion protrudes outwards from the first curved surface portion and the second curved surface portion, and when the damping hinge is located in the open state, the first curved surface portion and the second curved surface portion are both far away from the damping block so that the supporting portion and the damping block are separately disposed; when the damping hinge is in the critical state, the second curved surface part is abutted with the damping block, and the first curved surface part is close to the third connecting piece and is not abutted with the damping block; when the damping hinge is in the closed state, the second curved surface portion abuts against the damping block, and the connection portion of the first curved surface portion and the second curved surface portion and the third connecting piece are located above the damping block so as to prevent the damping block from sliding out of the second curved surface portion.

Further, the elastic component is provided with a matching surface, the door body fixing seat comprises a supporting shaft, the damping hinge is in a closed state from a critical state, the matching surface abuts against the supporting shaft to enable the door body fixing seat to drive the fourth connecting piece to rotate clockwise, the abutting part is in rolling abutting connection with the damping block, and the elastic component rotates around the supporting shaft; the damping hinge is from a critical state to an open state, the matching surface is separated from the supporting shaft, the door body fixing seat drives the fourth connecting piece to rotate anticlockwise under the action of external force, and the abutting part is separated from the damping block.

Further, the cabinet body fixing seat comprises a first through hole and a second through hole, the first connecting piece comprises a first positioning hole, a second positioning hole, a third positioning hole and a fourth positioning hole, the first positioning hole is aligned and fixed with the first through hole, the fourth positioning hole is close to the first positioning hole, and the second positioning hole is positioned between the first positioning hole and the third positioning hole; the second connecting piece comprises a first mounting hole, a first hinge hole and a second hinge hole, the first hinge hole is aligned and fixed with the third positioning hole, and the second hinge hole is fixed with the door body fixing seat; the third connecting piece comprises a first end with a first hole and a second end with a second hole, the first hole is aligned and fixed with the second through hole, and the second hole is fixed with the fourth connecting piece; the fourth connecting piece comprises a third hinge hole, a fourth hinge hole and a fifth hinge hole, the third hinge hole is aligned and fixed with the second positioning hole, the fourth hinge hole is aligned and fixed with the second hole, and the fifth hinge hole is fixed with the door body fixing seat; the spring assembly includes a mounting portion having a through hole, the through hole of the mounting portion being fixed in alignment with the first mounting hole.

Further, a position where the second hinge hole of the second link is fixed to the door body fixing seat is different from a position where the fifth hinge hole of the fourth link is fixed to the door body fixing seat, and a distance between a position where the first hinge hole of the second link is fixed to the first link and a position where the third hinge hole of the fourth link is fixed to the first link is equal to a distance between a position where the second hinge hole of the second link is fixed to the door body fixing seat and a position where the fifth hinge hole of the fourth link is fixed to the door body fixing seat.

Further, the second end of the third connecting piece is provided with a cam portion located at the outer side of the second hole, the inner side of the fourth hinge hole of the fourth connecting piece is provided with a cam arc portion, and the third connecting piece rotates relative to the fourth connecting piece through the cooperation of the cam portion and the cam arc portion and the cooperation of the second hole and the fourth hinge hole.

Further, the third connecting piece further comprises an arc-shaped abdicating part close to the second end, the propping part is close to one end, provided with the third hinge hole, of the fourth connecting piece, the arc-shaped abdicating part is abducted to the propping part, and the third connecting piece is subjected to arc-shaped bending treatment at the arc-shaped abdicating part so that the third connecting piece is nonlinear.

Further, the fourth connecting piece includes the mainboard portion, set up in the first plate body that has fourth hinge hole and fifth hinge hole in mainboard portion both sides and set up in the second plate body that has third hinge hole in mainboard portion both sides, the second plate body is located first plate body inboard, first plate body upwards surpasses the mainboard portion with the mainboard portion forms and dodges under damping hinge's the open state elastic component's the upper dodge space, first plate body with the second plate body downwards surpasses the mainboard portion with the mainboard portion forms and dodges under the space of dodging of third connecting piece, the mainboard portion of fourth connecting piece is in the arc bending process is done to cam arc department makes the mainboard portion of fourth connecting piece is nonlinear.

Further, the speed reducing assembly comprises a damping frame, a damping block and a damping rod, wherein the damping block and the damping rod are movably arranged in the damping frame, the damping block and the damping rod are integrally arranged, and the damping block is provided with a supporting surface in rolling butt joint with the supporting part.

Further, the damping frame is provided with a pair of support arms, each support arm is provided with a pair of alignment holes, the alignment holes are clamped on the outer side of one end of the fourth connecting piece, the alignment holes are outwards fixed with the first connecting piece, two ends of the support rod exceed the support arms and are fixed with the first connecting piece, and when the damping hinge is in an open state, the supporting part is separated from the supporting surface; when the damping hinge is in a closed state from a critical state, the abutting part is in rolling abutting connection with the abutting surface so as to reduce the closing speed of the damping hinge.

Compared with the prior art, the damping hinge has the following advantages:

(1) When the damping hinge is in a fully opened state, the elastic component is locked with the second connecting piece and is in a compressed state, the elastic component is separated from the door body fixing seat, and the abutting part of the fourth connecting piece is separated from the damping block of the speed reducing component, so that the damping hinge is in a completely free state without being influenced by other parts of the damping hinge; when the damping hinge is in a critical state, the elastic component and the second connecting piece are unlocked, the elastic component is in deformation recovery and is abutted with the door body fixing seat and rotates around the door body fixing seat to drive the damping hinge to move towards a closed state, meanwhile, the door body fixing seat drives the fourth connecting piece to rotate clockwise under the elasticity of the elastic component, so that the abutting part is in rolling and abutting connection with the damping block to reduce the closing speed of the damping hinge until the damping hinge enters the closed state, therefore, when the door body fixing seat is in a fully opened state, the elastic component does not apply closing acting force to the door body fixing seat, thereby effectively avoiding the collision risk caused by automatic closing of the door body fixing seat to a user, improving the use safety, and facilitating the user to take and put east and west; when the door body fixing seat rotates in a critical state, the elastic component applies closing acting force to the door body fixing seat, and meanwhile, the speed reducing component is used for reducing automatic closing speed, so that the door body fixing seat and the cabinet body fixing seat are finally and completely closed, and safety is kept.

(2) The curved surface structure design of the abutting part ensures that the abutting part is in rolling abutting connection with the damping block in the process of the damping hinge from the critical state to the closed state, so that hard interference can not occur, and the damping hinge can not be blocked in the self-closing state; meanwhile, due to the structural design of the first curved surface part and the second curved surface part of the supporting part and the design of the third connecting piece, when the damping hinge is in a closed state, the damping block is well abutted to the second curved surface part and cannot slide out of the second curved surface part, and the effective reduction or slowing down of the self-closing speed is ensured.

(3) The damping hinge has the structural design, so that the hinge can have larger opening degree when being opened, and is suitable for different use scenes; when the damping hinge is closed, the first connecting piece, the second connecting piece, the third connecting piece, the fourth connecting piece, the elastic component and the speed reducing component are contained between the cabinet body fixing seat and the door body fixing seat, so that the damping hinge is small in size and does not occupy space.

(4) The distance between the position of the second connecting piece fixed to the first connecting piece and the distance between the position of the fourth connecting piece fixed to the first connecting piece are equal to the distance between the position of the second connecting piece fixed to the door body fixing seat and the position of the fourth connecting piece fixed to the door body fixing seat, and the arrangement can enable the first connecting piece, the second connecting piece, the door body fixing seat and the fourth connecting piece to be switched in different states, always keep the parallelogram structure, enable the stress of the parts to be stable and avoid interference of the parts.

(5) The cabinet body fixing seat, the first connecting piece, the second connecting piece and the fourth connecting piece are of double-sided board structures, the damping hinge is in different positions and forms different gaps in the closing or opening process, and the double-sided board structures of the connecting pieces play a role in protecting other parts.

Drawings

FIG. 1 is a schematic perspective view of a damped hinge of the present invention in a fully open state;

FIG. 2 is a schematic perspective view of a first connector of the damping hinge of the present invention;

FIG. 3 is a schematic perspective view of a second connector of the damped hinge of the present invention;

FIG. 4 is a schematic perspective view of a third connector of the damped hinge of the present invention;

FIG. 5 is a schematic perspective view of a fourth connector of the damped hinge of the present invention;

FIG. 6 is a view of FIG. 5 from another angle;

FIG. 7 is a schematic perspective view of an elastic assembly of the damped hinge of the present invention;

FIG. 8 is an exploded perspective view of the spring assembly of the damped hinge of the present invention;

FIG. 9 is a schematic perspective view of a reduction assembly of the damping hinge of the present invention;

FIG. 10 is a perspective cross-sectional view of the damped hinge of the present invention in a fully open state;

FIG. 11 is a schematic perspective view of a damped hinge of the present invention in a critical state;

FIG. 12 is a perspective cross-sectional view of the damped hinge of the present invention in a critical state;

FIG. 13 is a schematic perspective view of a damped hinge of the present invention in a closed state;

FIG. 14 is a perspective cross-sectional view of the damped hinge of the present invention in a closed state;

FIG. 15 is a perspective view of the damping hinge of the present invention in a fully opened state after omitting the first connector and the main body of the door lock holder;

FIG. 16 is a schematic perspective view of the damping hinge of the present invention in a critical state after omitting the first connector and the main body of the lock holder;

fig. 17 is a schematic perspective view of the damping hinge in a closed state after omitting the first connecting member and the main body of the door lock fixing base.

In the figure: 100. damping hinges; 10. a cabinet fixing seat; 11. a receiving groove; 12. a first through hole; 13. a second through hole; 20. a door body fixing seat; 21. a main body; 211. a side portion; 22. a support; 221. a support shaft; 222. a fixing hole; 30. a first connector; 31. a first positioning hole; 32. a second positioning hole; 33. a third positioning hole; 34. a fourth positioning hole; 40. a second connector; 41. a side plate; 410. a clamping groove; 411. a first mounting hole; 412. a first hinge hole; 413. a second hinge hole; 42. a connecting plate; 420. a snap hole; 43. an accommodating space; 50. a third connecting member; 51. a first end; 511. a first hole; 52. a second end; 521. a second hole; 522. a cam section; 53. an arc abdication part; 60. a fourth connecting member; 61. a first plate body; 62. a second plate body; 610. an upper avoidance space; 620. a lower avoidance space; 621. a third hinge hole; 611. a fourth hinge hole; 612. a fifth hinge hole; 622. a cam arc portion; 63. a holding portion; 631. a first curved surface portion; 632. a second curved surface portion; 64. a main board section; 70. an elastic component; 71. a clip; 710. a mounting part; 7101. perforating; 711. a plug arm; 7110. a snap-fit protrusion; 712. a mounting column; 72. an elastic member; 73. a trigger; 730. a first plug-in connection; 731. a second plug-in connection; 7311. a plug-in groove; 7312. a stop block; 732. a top; 733. a clamping block; 734. a clamping shaft; 735. a mating surface; 80. a deceleration assembly; 81. a damping frame; 811. a support arm; 8110. an alignment hole; 812. a support rod; 82. a damping block; 821. a holding surface; 83. a damping rod.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or be present as another intermediate element through which the element is fixed. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In the invention, the damping hinge can be kept in an open state when in a completely open state by arranging the elastic component 70 and the speed reducing component 80, so that a user can conveniently take and put east and west; when the door is required to be closed, the door can be pre-tensioned to the closed position in a critical state, self-locking is formed, the door body and the cabinet body are prevented from being not completely closed, and when the door is closed, the self-closing speed is reduced to protect the door body and the cabinet body. When the damping hinge 100 is in the fully opened state, the elastic component 70 is locked with the second connecting piece 40, the elastic component 70 is in a compressed state, the elastic component 70 is separated from the door body fixing seat 20, at this time, the door body fixing seat 20 is in a free state and is not affected by the internal structural force of the damping hinge 100, and the door body fixing seat 20 can drive the fourth connecting piece 60 to rotate anticlockwise under the driving of an external force, so that the abutting part 63 of the fourth connecting piece 60 with a curved surface structure is separated from the damping block 82 of the speed reducing component 80, and the damping hinge 100 is in a completely free state and is not affected by other components of the damping hinge 100. When the damping hinge 100 is in the critical state, the elastic component 70 is unlocked from the second connecting piece 40, and the elastic component 70 is deformed to abut against the door body fixing seat 20 and rotate around the door body fixing seat 20 to drive the damping hinge 100 to move towards the closed state. Meanwhile, the door fixing base 20 drives the fourth connecting piece 60 to rotate clockwise under the elastic force of the elastic component 70, so that the abutting portion 63 is in rolling abutting contact with the damping block 82 to reduce the closing speed of the damping hinge 100 until the damping hinge 100 enters a closed state. Therefore, when the door body fixing seat 20 is in the fully opened state, the elastic component 70 does not apply closing force to the door body fixing seat 20, so that the risk of collision to a user caused by automatic closing of the door body fixing seat 20 can be effectively avoided, the use safety is improved, and the user can conveniently take and put east and west; when the door body fixing seat 20 rotates in the critical state, the elastic component 70 applies a closing force to the door body fixing seat 20, and meanwhile, the speed reducing component 80 is used for reducing the automatic closing speed, so that the door body fixing seat 20 and the cabinet body fixing seat 10 are finally and completely closed, the safety is kept, and the service life of the damping hinge is prolonged.

Referring to fig. 1 to 17, the damping hinge 100 of the present invention includes a cabinet fixing base 10, a door fixing base 20, a first connecting member 30, a second connecting member 40, a third connecting member 50, a fourth connecting member 60, an elastic member 70 and a decelerating member 80. The two ends of the first connecting piece 30 are respectively and rotatably connected with the cabinet body fixing seat 10 and the second connecting piece 40, the two ends of the second connecting piece 40 are respectively and rotatably connected with the first connecting piece 30 and the door body fixing seat 20, the two ends of the third connecting piece 50 are respectively and rotatably connected with the cabinet body fixing seat 10 and the fourth connecting piece 60, the two ends of the fourth connecting piece 60 are respectively and rotatably connected with the first connecting piece 30 and the door body fixing seat 20, the elastic component 70 is rotatably mounted on the second connecting piece 40, the speed reducing component 80 is rotatably mounted on the first connecting piece 30, and the two ends of the speed reducing component 80 are respectively and rotatably connected with the first connecting piece 30 and the fourth connecting piece 60.

The cabinet body fixing seat 10 is used for being fixed with the cabinet body. In this embodiment, the damping hinge 100 is applied to a refrigerator, and the cabinet fixing base 10 is fixed to the refrigerator cabinet. Referring to fig. 1, the cabinet fixing base 10 is provided with a receiving groove 11, a first through hole 12 and a second through hole 13.

The door body fixing seat 20 is used for fixing the door body. In this embodiment, the damping hinge 100 is applied to a refrigerator, and the door body fixing base 20 is fixed to a refrigerator door. Referring to fig. 1 and 10 to 12, the door fixing base 20 includes a main body 21 and a supporting member 22 fixed to the main body 21. The bottom of the main body 21 is a plane, and the supporting member 22 is located at the end of the main body 21. The main body 21 is further provided with a pair of side portions 211, and fixing through holes (not numbered) for fixing the second and fourth connectors 40 and 60 are provided on the side portions 211. The support member 22 is of a double-plate design, and is of a triangular structure as a whole, so that the structural strength is improved. The support 22 is provided with a support shaft 221 and a fixing hole 222. The fixing hole 222 is aligned with the fixing through hole of the second connector 40 fixed to the side 211.

Referring to fig. 2, the first connecting member 30 is not of a double-plate design, and has a U-shaped cross section, so that the interior of the first connecting member 30 can accommodate other components while increasing the structural strength, thereby reducing the volume of the hinge and protecting the other components. The first connecting member 30 includes a first positioning hole 31, a second positioning hole 32, a third positioning hole 33, and a fourth positioning hole 34. Wherein the second positioning hole 32 is located between the first positioning hole 31 and the third positioning hole 33, and the fourth positioning hole 34 is disposed near the first positioning hole 31. The first positioning hole 31 is disposed corresponding to the first through hole 12, and is aligned and fixed. Wherein the alignment and securement referred to herein refers to, but is not limited to, aligning the holes involved and securing them after passing an external pin through the holes.

With continued reference to fig. 3, the second connecting member 40 includes two side plates 41 and a connecting plate 42 connecting the two side plates 41. The two side plates 41 are parallel to each other, and a receiving space 43 is formed between the two side plates 41 and the connecting plate 42 for mounting and receiving the elastic component 70. Each side plate 41 is provided with an arc-shaped clamping groove 410, a first mounting hole 411, a first hinge hole 412 and a second hinge hole 413. The slot 410 receives a post 734 to lock the resilient assembly 70 to the second connector 40. Specifically, the slot 410 is arc-shaped and the end of the slot 410 is open, so that the clamping shaft 734 can be separated from the slot 410, and the elastic component 70 is unlocked from the second connecting member 40. The first hinge hole 412 and the second hinge hole 413 are respectively located at opposite ends of the side plate 41, and the first mounting hole 411 is located between the first hinge hole 412 and the second hinge hole 413 near the first hinge hole 412. The first mounting hole 411 is used for mounting the elastic assembly 70, so that the elastic assembly 70 can be rotatably mounted on the second connecting piece 40 and is located in the accommodating space 43. The first hinge hole 412 is aligned with the third positioning hole 33 of the first link 30 to be rotatably coupled. The second hinge hole 413 is rotatably coupled to the side portion 211 of the door body holder 20. The connecting plate 42 is provided with a fastening hole 420, and the fastening hole 420 is used for fastening with a following fastening block 733, so that the elastic assembly 70 is locked with the second connecting piece 40.

With continued reference to fig. 4, the third connecting member 50 includes a first end 51 having a first hole 511, a second end 52 having a second hole 521, and an arc-shaped abdication portion 53 between the first end 51 and the second end 52. While the second end 52 is further provided with a cam portion 522 located outside the second bore 521. The first hole 511 of the third connecting member 50 is aligned with and fixed to the second through hole 13 of the cabinet fixing base 10. The second hole 521 of the third link 50 is fixed to the fourth link 60.

With continued reference to fig. 5 and 6, the fourth connecting member 60 is of a double-plate design, so that the structural strength is increased, and meanwhile, other components can be accommodated in the fourth connecting member 60, so that the volume of the hinge is reduced and the other components are protected. The fourth connector 60 includes a main board 64, a pair of first boards 61 and a pair of second boards 62 located on both sides of the main board 64. The second plate 62 is disposed at two opposite sides of the first plate 61, and a pair of the second plates 62 are disposed in a pair of the first plates 61. The second plate 62 is provided with a third hinge hole 621, and the third hinge hole 621 is aligned with and fixed to the second positioning hole 32 of the first connecting member 30. The first plate 61 is provided with a fourth hinge hole 611 and a fifth hinge hole 612, and the fourth hinge hole 611 is located between the third hinge hole 621 and the fifth hinge hole 612. The fourth hinge hole 611 is aligned and fixed corresponding to the second hole 521 of the third link 50, and the fifth hinge hole 612 is fixed corresponding to the side 211 of the door body fixing base 20.

The position where the second hinge hole 413 of the second connector 40 is fixed to the side portion 211 of the door body holder 20 is different from the position where the fifth hinge hole 612 of the fourth connector 60 is fixed to the side portion 211 of the door body holder 20. More specifically, the distance between the position (third positioning hole 33) where the first hinge hole 412 of the second link 40 is fixed to the first link 30 and the position (second positioning hole 32) where the third hinge hole 621 of the fourth link 60 is fixed to the first link 30 is equal to the distance between the position where the second hinge hole 413 of the second link 40 is fixed to the side 211 of the door body fixing base 20 and the position where the fifth hinge hole 612 of the fourth link 60 is fixed to the side 211 of the door body fixing base 20. By the arrangement, the first connecting piece 30, the second connecting piece 40, the door body fixing seat 20 and the fourth connecting piece 60 can always keep the parallelogram structure under different state switching, so that the parts are stressed stably and can not be interfered with each other.

The inner side of the fourth hinge hole 611 of the fourth connecting member 60 is provided with a cam arc portion 622, specifically, the end of the second plate 62 corresponding to the inner side of the fourth hinge hole 611 is provided with the cam arc portion 622, and the third connecting member 50 rotates relative to the fourth connecting member 60 through the cooperation of the cam portion 522 and the cam arc portion 622 and the cooperation of the second hole 521 of the third connecting member 50 and the fourth hinge hole 611. The first plate 61 protrudes upward beyond the main plate 64 to form an upper escape space 610 with the main plate 64 for escaping the elastic member 70 in the opened state of the damping hinge 100, and the first plate 61 and the second plate 62 protrude downward beyond the main plate 64 to form a lower escape space 620 with the main plate 64 for escaping the third connecting member 50.

The fourth connecting piece 60 further includes a supporting portion 63 located at the inner side of the pair of second plate portions 62 and protruding out of the second plate portions 62, the supporting portion 63 is disposed near one end of the fourth connecting piece 60 where the third hinge hole 621 is disposed, and the arc-shaped abdicating portion 53 of the third connecting piece 50 is abducted to the supporting portion 63. The supporting portion 63 is disposed in a curved surface structure, the supporting portion 63 includes a first curved surface portion 631 and a second curved surface portion 632 disposed below the first curved surface portion 631, and a connection portion between the first curved surface portion 631 and the second curved surface portion 632 protrudes outwards from the first curved surface portion 631 and the second curved surface portion 632. When the damping hinge 100 is in the open state, the first curved surface portion 631 and the second curved surface portion 632 are both disposed away from the damping block 82, so that the abutting portion 63 is disposed separately from the damping block 82. When the damping hinge 100 is in the critical state, the second curved surface portion 632 abuts against the damping block 82, and the first curved surface portion 631 approaches the third connecting element 50, specifically, the arc-shaped abdication portion 53 of the third connecting element 50, but does not abut against the damping block 82. When the damping hinge 100 is in the closed state, the second curved surface portion 632 abuts against the damping block 82, the connection portion between the first curved surface portion 631 and the second curved surface portion 632, and the third connecting member 50 are located above the damping block 82, so as to prevent the damping block 82 from sliding out of the second curved surface portion 632, thereby ensuring that the closing speed of the damping hinge 100 can be effectively reduced or slowed down in the self-closing process.

The third connecting member 50 is bent in an arc shape at the arc-shaped abdicating portion 53 so that the third connecting member 50 is nonlinear, and the main plate portion 64 of the fourth connecting member 60 is bent in an arc shape at the cam arc-shaped portion 622 so that the main plate portion 64 of the fourth connecting member 60 is nonlinear. And the third connecting piece 50 is reinforced at the arc-shaped abdication part 53, and the whole third connecting piece 50 is thicker, which is beneficial to improving the buffering capacity. The main plate portion 64 of the fourth connecting member 60 is also reinforced corresponding to the cam arc portion 622, so as to improve the buffering capacity.

Referring to fig. 7 to 17, the elastic component 70 is configured to provide a pre-tightening force to the damping hinge 100 when closed, and includes a catch 71, an elastic member 72 and a trigger 73.

The fastener 71 includes a mounting portion 710, a mating arm 711, and a mounting post 712. The mounting portion 710 is provided with a through hole 7101, and the through hole 7101 is aligned with the first mounting hole 411 of the second connector 40, so that the elastic component 70 is rotatably mounted on the second connector 40. The plugging arm 711 extends from the mounting portion 710, and the plugging arm 711 is plugged with the trigger member 73 to provide a deformation space for the elastic member 72, so that the fastening member 71 keeps engaged with the trigger member 73. The number of the plug arms 711 is plural, and the plurality of plug arms 711 stabilizes the engagement of the fastener 71 with the trigger 73. Specifically, in this embodiment, the number of the plugging arms 711 is two, and the two plugging arms 711 are symmetrically disposed with respect to the mounting portion 710. The end of each of the latch arms 711 remote from the mounting portion 710 is provided with a snap projection 7110, which snap projection 7110 snaps with a below-mentioned stop 7312, preventing the latch arms 711 from coming out of below-mentioned latch grooves 7311. The mounting post 712 extends from the mounting section 710 and is located between the two mating arms 711. The mounting post 712 is configured to receive the elastic member 72 and guide the elastic member 72. The mounting posts 712 have a cross-shaped configuration so that the spring 72 better retains its elasticity and allows more spring space within the spring 72.

The two ends of the elastic member 72 respectively abut against the fastening member 71 and the triggering member 73, and provide elastic force to the triggering member 73, so that the triggering member 73 provides a closing pre-tightening force to the door body fixing seat 20. The elastic member 72 is any one of a spring, a disc spring, a shrapnel and a compression spring. Specifically, in this embodiment, the elastic member 72 is preferably a spring, and the elastic member 72 is sleeved on the mounting post 712.

The trigger 73 includes a first plug portion 730, a second plug portion 731, a top 732, a clamping block 733, a clamping shaft 734, and a mating surface 735. The top 732 connects the first socket 730 and the second socket 731, and a space for accommodating the elastic member 72 and the mounting post 712 is formed between the first socket 730 and the second socket 731. The first insertion portion 730 and the second insertion portion 731 are respectively provided with an insertion slot 7311 and a stop block 7312 located at the end of the insertion slot 7311. The insertion groove 7311 is engaged with the insertion arm 711, so that when the trigger 73 is unlocked from the second connector 40, the trigger 73 slides relative to the catch member 71 under the elastic force of the elastic member 72 to engage with the support shaft 221. The stopper 7312 limits the moving distance of the trigger 73. The clamping block 733 is disposed on the second plug portion 731, and the clamping block 733 is configured to be clamped to the clamping hole 420, so that the elastic assembly 70 is locked to the second connector 40. The clamping shaft 734 is disposed on the first inserting portion 730, and the clamping shaft 734 is configured to be buckled with the clamping groove 410, so that the elastic component 70 is locked with the second connector 40. The mating surface 735 is disposed on the top 732, the mating surface 735 is an arc surface, and the mating surface 735 can be mated with the support shaft 221, so that the elastic assembly 70 rotates around the support shaft 221, and provides a pretightening force for the door fixing seat 20, so as to ensure that the door body and the cabinet body are finally closed.

Referring to fig. 9 to 17, the deceleration assembly 80 includes a damping frame 81, a damping block 82 and a damping rod 83 disposed in the damping frame 81, wherein the damping block 82 and the damping rod 83 are integrally disposed. The damper block 82 is used to reduce the closing speed of the damped hinge 100. The damping frame 81 is disposed around the damping block 82, and the damping block 82 and the damping rod 83 are movably disposed in the damping frame 81. The damping block 82 is provided with a supporting surface 821, the damping frame 81 includes support arms 811 positioned at two sides of the damping block 82 and a supporting rod 812 positioned at the bottom end of the damping block 82, the damping block 82 is movably arranged on the supporting rod 812 through a damping rod 83, and the supporting surface 821 is far away from the top end of the support arms 811. In this embodiment, the damping frame 81 is provided with a pair of support arms 811, each support arm 811 is provided with a pair of alignment holes 8110, the pair of alignment holes 8110 are clamped at the outer side of one end of the fourth connecting member 60, the alignment holes 8110 are aligned and fixed with the third hinge holes 621 of the fourth connecting member 60 inwards, and the alignment holes 8110 are aligned and fixed with the second positioning holes 32 of the first connecting member 30 outwards. The two ends of the supporting rod 812 extend beyond the supporting arm 811 and are fixed to the fourth positioning hole 34 of the first connecting member 30.

The relationship of the components of the damped hinge 100 in three different states and the switching process between the three different states will be described in detail below:

when the damping hinge 100 is used, the cabinet body fixing seat 10 is fixedly connected with the cabinet body, and the door body fixing seat 20 is fixedly connected with the door body. When the damping hinge 100 is in the fully opened state, referring to fig. 1, 10 and 15, the included angle between the door fixing base 20 and the cabinet fixing base 10 is an obtuse angle, so as to meet the requirement of large opening of the hinge. At this time, the clamping block 733 of the elastic assembly 70 is in snap fit with the fastening hole 420 of the second connector 40, and the clamping shaft 734 of the elastic assembly 70 is in snap fit with the clamping groove 410 of the second connector 40, so that the elastic assembly 70 is locked with the second connector 40, and the elastic member 72 is in a compressed state. The elastic component 70 is separated from the door body fixing seat 20, more specifically, the mating surface 735 is separated from the supporting shaft 221, at this time, the door body fixing seat 20 is in a free state, and is not affected or forced by other components of the damping hinge 100, that is, the elastic component 70 does not apply elastic force (a closed pre-tightening force) to the door body fixing seat 20, so that the door body is kept in an open state, and a user can conveniently take and place east and west. At this time, the second curved surface portion 632 of the abutting portion 63 is separated from the abutting surface 821 of the damping block 82 such that the abutting portion 63 is separated from the damping block 82, that is, the damping hinge 100 is in the open state, the self-closing speed thereof does not need to be reduced because the damping hinge 100 is not self-closed at this time. And the first curved surface portion 631 of the abutting portion 63 is disposed near the arc-shaped abdication portion 53 of the third connecting member 50.

When the damping hinge 100 is in the critical state, referring to fig. 11, 12 and 16, the clamping block 733 of the elastic assembly 70 is disengaged from the clamping hole 420 of the second connector 40, the clamping shaft 734 of the elastic assembly 70 slides out of the clamping groove 410 of the second connector 40, the elastic assembly 70 and the second connector 40 are unlocked, the elastic member 72 is restored to deform, the triggering member 73 slides relative to the clamping member 71 under the action of the elastic force of the elastic member 72 until the mating surface 735 of the triggering member 73 abuts against the supporting shaft 221, the elastic assembly 70 rotates around the supporting shaft 221 under the action of the elastic force of the elastic member 72, and the elastic force of the elastic member 72 is transferred to the door fixing seat 20, so that the damping hinge 100 moves toward the fully closed state. At this time, since the door body fixing base 20 is subject to the elastic force of the elastic component 70, that is, the pre-tightening force of the damping hinge 100, the door body fixing base 20 drives the fourth connecting piece 60 to rotate clockwise under the elastic force of the elastic component 70, so that the abutting portion 63 of the fourth connecting piece 60 is in rolling contact with the abutting surface 821 of the damping block 82, specifically, the second curved surface portion 632 is in rolling contact with the abutting surface 821 of the damping block 82, and the connection position of the first curved surface portion 631 and the second curved surface portion 632 protrudes from the first curved surface portion 631 and the second curved surface portion 632, so that the abutting portion 63 further abuts against the abutting surface 821, and the damping block 82 slides in the direction of the strut 812, so that the third connecting piece 50 and the fourth connecting piece 60 transfer the resistance force in the opposite direction to the door body fixing base 20, thereby reducing the closing speed of the damping hinge 100 until the hinge 100 enters the closed state.

When the damping hinge 100 is in the closed state, please refer to fig. 13, 14 and 17, at this time, the clamping block 733 of the elastic component 70 has been completely separated from the clamping hole 420 of the second connecting piece 40, the clamping shaft 734 of the elastic component 70 has been completely slid out of the clamping slot 410 of the second connecting piece 40, the second connecting piece 40 is completely unlocked from the elastic component 70, and at this time, the abutting portion 63 of the fourth connecting piece 60 still abuts against the abutting surface 821 of the damping block 82. At this time, the abutting portion 63 is in an extreme state of abutting against the abutting surface 821 of the damper block 82. At this time, the first connecting member 30, the second connecting member 40, the third connecting member 50, the fourth connecting member 60, the elastic assembly 70 and the speed reducing assembly 80 of the damping hinge 100 are received between the cabinet fixing base 10 and the door fixing base 20, and the bottom of the cabinet fixing base 10 is parallel to the top of the door fixing base 20.

In this embodiment, when the damping hinge 100 is in the critical state, the included angle between the door body fixing base 20 and the cabinet body fixing base 10 is between 15 degrees and 20 degrees.

When the refrigerator door needs to be opened, that is, the damping hinge 100 needs to be opened from the closed state to the critical state, at this time, the required external force needs to be greater than the pretightening force applied to the damping hinge 100, at this time, the external force drives the door body fixing seat 20, and the door body fixing seat 20 drives the second connecting piece 40 and the fourth connecting piece 60 to rotate anticlockwise under the action of the external force, so that the second curved surface portion 632 of the abutting portion 63 of the fourth connecting piece 60 abuts against the abutting surface 821 of the damping block 82, that is, under the action of the external force, the abutting portion 63 rotates (rotates anticlockwise) in a direction away from the abutting surface 821 of the damping block 82. The clamping block 733 of the elastic component 70 moves in a direction approaching the clamping hole 420, and the clamping shaft 734 also moves in a direction approaching the clamping groove 410 until the clamping shaft is in a critical state. The elastic member 70 also rotates counterclockwise, so that the mating surface 735 of the elastic member 70 rotates away from the support shaft 221. Since the door fixing base 20 still receives the pre-tightening force of the elastic component 70 at this time, if the refrigerator needs to be completely opened, the external force still needs to be kept on the door fixing base 20 until the second curved surface portion 632 of the supporting portion 63 of the fourth connecting component 60 is separated from the supporting surface 821 of the damping block 82, the clamping shaft 734 is clamped in the clamping groove 410, the clamping block 733 is clamped in the clamping hole 420, so that the elastic component 70 and the second connecting component 40 are from the unlocked state to the locked state, and the mating surface 735 of the elastic component 70 is separated from the supporting shaft 221, thereby completing the switching of the damping hinge 100 from the closed state to the opened state.

When the damping hinge 100 is required to be opened to be closed, the damping hinge 100 is in a free state and does not receive the force inside the damping hinge 100, and an external force is required to be applied to the door body fixing seat 20 because the included angle between the door body fixing seat 20 and the cabinet body fixing seat 10 is greater than the range of 15 degrees to 20 degrees (critical state). At this time, the door fixing base 20 drives the second connecting piece 40 and the fourth connecting piece 60 to rotate clockwise until the door passes through the critical state, the clamping shaft 734 slides out of the clamping groove 410, the clamping block 733 exits the clamping hole 420, the elastic component 70 is unlocked from the second connecting piece 40, the mating surface 735 of the elastic component abuts against the supporting shaft 221, so that the door fixing base 20 is under the elastic force of the elastic component 70, the elastic component 70 rotates clockwise around the supporting shaft 221, and the door fixing base 20 drives the fourth connecting piece 60 to move clockwise under the driving of the elastic force, so that the second curved surface 632 of the abutting part 63 moves clockwise to abut against the abutting surface 821 of the damping block 82, and has a reverse resistance to the door fixing base 20, so as to reduce the self-closing speed of the damping hinge 100 until the door fixing base completely enters the closed state. When the vehicle enters the closed state, the second curved surface portion 632 is completely abutted against the abutting surface 821, and the connection portion between the second curved surface portion 632 and the first curved surface portion 631 and the third connecting member 50 are located above the damping block 82 of the speed reducing assembly 80, so as to prevent the abutting surface 821 from sliding out of the second curved surface portion 632. In this process, the function of reducing the self-closing speed of the damped hinge 100 during self-closing is ensured.

The present invention also includes a refrigerator including the above-described damper hinge 100.

(6) In this application, when the damping hinge 100 is in the fully opened state, the elastic component 70 is locked with the second connecting piece 40 and the elastic component 70 is in the compressed state, the elastic component 70 is separated from the door body fixing seat 20, and the abutting portion 63 of the fourth connecting piece 60 is separated from the damping block 82 of the speed reducing component 80, so that the damping hinge 100 is in a completely free state without being affected by other components of the damping hinge 100; when the damping hinge 100 is in the critical state, the elastic component 70 is unlocked from the second connecting piece 40, the elastic component 70 resumes deformation and contacts with the door body fixing seat 20 and rotates around the door body fixing seat 20 to drive the damping hinge 100 to move towards the closed state, and simultaneously, the door body fixing seat 20 drives the fourth connecting piece 60 to rotate clockwise under the elastic force of the elastic component 70, so that the abutting part 63 is in rolling contact with the damping block 82 to reduce the closing speed of the damping hinge 100 until the damping hinge 100 enters the closed state. Therefore, when the door body fixing seat 20 is in the fully opened state, the elastic component 70 does not apply closing force to the door body fixing seat 20, so that the risk of collision to a user caused by automatic closing of the door body fixing seat 20 can be effectively avoided, the use safety is improved, and the user can conveniently take and put east and west; when the door fixing base 20 rotates in the critical state, the elastic component 70 applies a closing force to the door fixing base 20, and the deceleration component 80 is used for reducing the automatic closing speed, so that the door fixing base 20 and the cabinet fixing base 10 are completely closed finally and keep safety. The curved surface structure design of the abutting part 63 ensures that the abutting part 63 is in rolling abutting connection with the damping block 82 in the process of the damping hinge 100 from the critical state to the closed state, so that hard interference can not occur, and the damping hinge 100 can not be blocked in the self-closing state; meanwhile, due to the structural design of the first curved surface portion 631 and the second curved surface portion 632 of the abutting portion 63 and the connection between the first curved surface portion 632 and the second curved surface portion 632 of the first curved surface portion 631, and the design of the third connecting piece 50, when the damping hinge 100 is in the closed state, the damping block 82 is well abutted against the second curved surface portion 632, and cannot slide out of the second curved surface portion 632, so that the effective reduction or slowing of the self-closing speed is ensured. The structural design of the damping hinge 100 enables the hinge to have larger opening degree when being opened, and is applicable to different use scenes; when the damping hinge is closed, the first connecting piece 30, the second connecting piece 40, the third connecting piece 50, the fourth connecting piece 60, the elastic component 70 and the speed reducing component 80 are accommodated between the cabinet fixing base 10 and the door fixing base 20, so that the damping hinge 100 is small in size and does not occupy space. The distance between the position of the second connecting piece 40 fixed to the first connecting piece 30 and the position of the fourth connecting piece 60 fixed to the first connecting piece 30 is equal to the distance between the position of the second connecting piece 40 fixed to the door body fixing seat 20 and the position of the fourth connecting piece 60 fixed to the door body fixing seat 20, and the arrangement is such that the first connecting piece 30, the second connecting piece 40, the door body fixing seat 20 and the fourth connecting piece 60 can always keep the parallelogram structure under different state switching, so that the parts are stressed stably and are not interfered with each other. The cabinet body fixing seat 10, the first connecting piece 30, the second connecting piece 40 and the fourth connecting piece 60 are of double-sided board structure, the damping hinge 100 is in different positions and forms different gaps when being closed or opened, and the double-sided board structure of the connecting piece plays a role in protecting other parts.

The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, it is possible to make several modifications and improvements without departing from the concept of the present invention, which are equivalent to the above embodiments according to the essential technology of the present invention, and these are all included in the protection scope of the present invention.

Claims

1. The utility model provides a damping hinge, includes cabinet body fixing base and door body fixing base, its characterized in that: the damping hinge also comprises a first connecting piece, a second connecting piece, a third connecting piece, a fourth connecting piece, an elastic component and a speed reducing component,

2. The damped hinge of claim 1, wherein: the supporting part comprises a first curved surface part and a second curved surface part positioned below the first curved surface part, the joint of the first curved surface part and the second curved surface part protrudes outwards from the first curved surface part and the second curved surface part, and when the damping hinge is positioned in the opening state, the first curved surface part and the second curved surface part are both far away from the damping block so that the supporting part and the damping block are separated; when the damping hinge is in the critical state, the second curved surface part is abutted with the damping block, and the first curved surface part is close to the third connecting piece and is not abutted with the damping block; when the damping hinge is in the closed state, the second curved surface portion abuts against the damping block, and the connection portion of the first curved surface portion and the second curved surface portion and the third connecting piece are located above the damping block so as to prevent the damping block from sliding out of the second curved surface portion.

3. The damped hinge of claim 2, wherein: the elastic component is provided with a matching surface, the door body fixing seat comprises a supporting shaft, the damping hinge is in a closed state from a critical state, the matching surface abuts against the supporting shaft to enable the door body fixing seat to drive the fourth connecting piece to rotate clockwise, the abutting part is in rolling abutting joint with the damping block, and the elastic component rotates around the supporting shaft; the damping hinge is from a critical state to an open state, the matching surface is separated from the supporting shaft, the door body fixing seat drives the fourth connecting piece to rotate anticlockwise under the action of external force, and the abutting part is separated from the damping block.

4. The damped hinge of claim 1, wherein: the cabinet body fixing seat comprises a first through hole and a second through hole, the first connecting piece comprises a first positioning hole, a second positioning hole, a third positioning hole and a fourth positioning hole, the first positioning hole is aligned and fixed with the first through hole, the fourth positioning hole is close to the first positioning hole, and the second positioning hole is positioned between the first positioning hole and the third positioning hole; the second connecting piece comprises a first mounting hole, a first hinge hole and a second hinge hole, the first hinge hole is aligned and fixed with the third positioning hole, and the second hinge hole is fixed with the door body fixing seat; the third connecting piece comprises a first end with a first hole and a second end with a second hole, the first hole is aligned and fixed with the second through hole, and the second hole is fixed with the fourth connecting piece; the fourth connecting piece comprises a third hinge hole, a fourth hinge hole and a fifth hinge hole, the third hinge hole is aligned and fixed with the second positioning hole, the fourth hinge hole is aligned and fixed with the second hole, and the fifth hinge hole is fixed with the door body fixing seat; the spring assembly includes a mounting portion having a through hole, the through hole of the mounting portion being fixed in alignment with the first mounting hole.

5. The damped hinge of claim 4, wherein: the position where the second hinge hole of the second connector is fixed to the door body fixing seat is different from the position where the fifth hinge hole of the fourth connector is fixed to the door body fixing seat, and the distance between the position where the first hinge hole of the second connector is fixed to the first connector and the position where the third hinge hole of the fourth connector is fixed to the first connector is equal to the distance between the position where the second hinge hole of the second connector is fixed to the door body fixing seat and the position where the fifth hinge hole of the fourth connector is fixed to the door body fixing seat.

6. The damped hinge of claim 5, wherein: the second end of the third connecting piece is provided with a cam part positioned at the outer side of the second hole, the inner side of the fourth hinge hole of the fourth connecting piece is provided with a cam arc part, and the third connecting piece rotates relative to the fourth connecting piece through the cooperation of the cam part and the cam arc part and the cooperation of the second hole and the fourth hinge hole.

7. The damped hinge of claim 6, wherein: the third connecting piece further comprises an arc-shaped abdicating part close to the second end, the propping part is close to one end, provided with the third hinge hole, of the fourth connecting piece, the arc-shaped abdicating part is abducted to the propping part, and the third connecting piece is subjected to arc-shaped bending treatment at the arc-shaped abdicating part so that the third connecting piece is nonlinear.

8. The damped hinge of claim 7, wherein: the fourth connecting piece includes mainboard portion, set up in the first plate body that has fourth hinge hole and the fifth hinge hole of mainboard portion both sides and set up in the second plate body that has the third hinge hole of mainboard portion both sides, the second plate body is located first plate body inboard, first plate body upwards surpasses mainboard portion with mainboard portion forms and dodges under damping hinge's the open state dodges space on elastic component dodges, first plate body with second plate body downwards surpasses mainboard portion with mainboard portion forms dodges down of third connecting piece dodges the space, the mainboard portion of fourth connecting piece is in the arc bending process is done to cam arc department makes the mainboard portion of fourth connecting piece is non-linear type.

9. The damped hinge of claim 8, wherein: the speed reducing assembly comprises a damping frame, a damping block and a damping rod, wherein the damping block and the damping rod are movably arranged in the damping frame, the damping block and the damping rod are integrally arranged, and the damping block is provided with a supporting surface in rolling contact with the supporting part.

10. The damped hinge of claim 9, wherein: the damping frame is provided with a pair of support arms, each support arm is provided with a pair of alignment holes, the alignment holes are clamped on the outer side of one end of the fourth connecting piece, the alignment holes are outwards fixed with the first connecting piece, two ends of each support arm exceed the support arm and are fixed with the first connecting piece, and when the damping hinge is in an open state, the supporting part is separated from the supporting surface; when the damping hinge is in a closed state from a critical state, the abutting part is in rolling abutting connection with the abutting surface so as to reduce the closing speed of the damping hinge.